A Photometric Investigation of the Magnetic Star 53 Cameloprdalis

Geneva photometry of the important and relatively well known Ap star 53 Cam (HR 3109, HD 65339) is presented. These 27 data, which cover rather evenly the rotational phase interval, are compared with the photometric data in ten bandpasses published by Musielok et al. (1980). They allow to show that at least four “null-wavelength regions” occur between 3400 and 7800 A.